I'm another with Wallis & Bumbly & consequently DD will eat pretty much anything (bar meat & quiche) .....
& she is one stubborn Moo, so trust me there have been some MAJOR stand offs in the early days & it was BLOODY HARD WORK ....but I am twice as stubborn & didn't give in ....even if it meant her going to bed without food, so be it, as it meant she learned quickly it was my way or nothing.....I DID sometimes have to think outside the box when she hit her fussy phase though, I suppose a bit "Lola & Charlie" in that everyday healthy foods became something "special" beans & pulses were various fairy & pixie foods for example...it worked
but I do believe the main thing was I didn't give in ...EVER.... she also didn't have ANY sweets or Chocolate, fizzy drinks, crisps etc etc until she was past the toddler stage, she was told all the brightly packaged junk foods at DCs eye level in the Supermarkets weren't human food, but for whatever Character they used in the advert.....she still only sweets at weekends & special occasions & not in the morning.....she can now be trusted to Police herself on that & has a fantastic understanding of what is good healthy food for her age, & understands it fuel for your body & the wrong fuel isn't good for you
I can appreciate that lots of factors can come into play & mean that its not so easy with extended family giving wrong foods etc...we've had that too, but DD knows it won't happen at home.
I also understand that with SN kids it can be a massive challenge, we have close friends with SN DCs & were as they have had to give into things that they wouldn't dream of with their other kids, but they have also found ways of making sure that DC does eat as healthily as possible, ie: our friends Autistic boy will eat nothing but Kentucky Chicken & white bread ham sandwiches & really WOULD have starved himself if not given these because he just can't handle the texture of other things, but he will eat some soft none seeded fruits....though I do think having a Gran who works with SN & spotted his problems very early helped in that a lot, in that she had a good understanding of WHY he refused & kicked off at a lot of things & found ways around that...so perhaps the late diagnoses for a lot of SN DCs doesn't help families set down the right dietary foundations, which is very :( & not the families fault
& I'm sorry, but IMHO there will never be an excuse for giving DCs a mars bar for breakfast - I really hope that was a joke :(